No screws were used within the side framing of the pond, all 6” and 8” timberlok screws went down from the top of each 4”x6” lumber framing as the pond went up. There is a lot of Timberlake screws in this pond rebuild. I used the old pond liner and 1” styrofoam on the ground beneath the pond along with sand. Here is a picture taken this morning. I have seen a lot of mole activity in my yard over the summer, would moles damage the liner with their claws. I can’t see any damage but that don’t mean there isn’t. The liner is heavy duty 45 mil epdm liner.